The nurse is teaching a class on muscular coordination and explains it is the movement of what electrolyte that contributes to the process of muscle contraction and relaxation?
Magnesium.
Chloride.
Calcium.
Hydrogen.
The Correct Answer is C
Choice A rationale
Magnesium plays a role in muscle relaxation but is not primarily responsible for muscle contraction. It helps in stabilizing the muscle membrane by acting as a natural calcium blocker. Deficiency in magnesium can lead to muscle cramps and spasms, but it does not directly cause muscle contraction and relaxation processes.
Choice B rationale
Chloride is an essential electrolyte involved in maintaining fluid balance and acid-base balance, but it does not directly influence muscle contraction and relaxation. It works in conjunction with sodium to regulate osmotic pressure and acid-base balance.
Choice C rationale
Calcium is crucial for muscle contraction. It is released from the sarcoplasmic reticulum within the muscle cells and binds to troponin, causing a conformational change that allows actin and myosin to interact and generate contraction. During relaxation, calcium ions are pumped back into the sarcoplasmic reticulum.
Choice D rationale
Hydrogen ions are involved in pH balance and acid-base regulation but do not directly affect muscle contraction and relaxation. Excess hydrogen ions (acidosis) can impair muscle function, but they are not the primary factor in muscle contraction processes.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Choice A rationale
Monitoring the weekly pulse is not sufficient for managing ventricular arrhythmias at home. Continuous or daily monitoring of vital parameters is more effective.
Choice B rationale
Monitoring daily fluid intake is essential for overall health but not directly related to the management of ventricular arrhythmias with propranolol (Inderal).
Choice C rationale
Daily blood pressure monitoring is crucial for patients on propranolol, as this medication can significantly lower blood pressure, and tracking it helps prevent hypotension.
Choice D rationale
Weekly weight monitoring is important for patients with heart conditions, but daily monitoring of blood pressure is more directly related to the management of ventricular arrhythmias with propranolol.
Correct Answer is B
Explanation
Choice A rationale
The rebound effect is typically associated with decongestants rather than topical nasal steroids. It occurs when nasal congestion worsens after stopping decongestant use.
Choice B rationale
Local ulceration is a potential adverse reaction to topical nasal steroids due to the localized irritation and thinning of the nasal mucosa with prolonged use.
Choice C rationale
Increased nasal drainage is not a common adverse reaction to topical nasal steroids. These medications typically reduce inflammation and decrease nasal drainage.
Choice D rationale
Suppression of healing is not an adverse reaction associated with topical nasal steroids. These drugs are more likely to reduce inflammation and promote healing of the nasal mucosa.
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